Posted in Machine Tools

Face Plate Work for Cylindrical Gripping Surface

For workpieces which are not very long or have no cylindrical gripping surface, face plate mounting is convenient. A face plate is provided with many radial slots. These can be used for anchoring clamping studs and heel supports, used for plate clamps. Workpieces with eccentric bore can be machined by centralizing the bore, by suitably moving the workpiece along the face plate, and clamping it in a centralized position. As the name implies, face plate is very convenient for facing work. In fact, there are special facing lathes which have only a face plate and tool carriage, and no tailstock. Other miscellaneous operations possible on lathe Ingenious turners/engineers can execute many other operations on the…

Posted in Machine Tools

Role of Chuck Holding Device on Lathe

Role of Chuck Holding Device on Lathe: Instead of using a carrier dog for drive, we can grip one end of the workpiece in a chuck. A selfcentering three jaw chuck [Fig. 1.12a] can centralize a workpiece within 0.1–0.2 mm. All three jaws can be opened or closed simultaneously, by a single key. For a long shaft, with a hole at one end, the chuck and steady arrangement [Fig. 1.12b] can be used. Holding a long shaft in chuck at L.H. end and providing a center support at the other end, is also quite common. Workpieces which are not very long, can be conveniently…

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Basic Machine Tools Based on Various Machining Operations

Basic machining operations comprise turning, drilling, reaming, boring, facing, milling, broaching, grinding, lapping, and honing. Turning Macine Turning machine or Lathe is the mother of all machine tools.With some ingenuity most of the machining operations can be carried out on lathe. 1. Center Lathe The center lathe [Fig. 1.1] has been in use for over 200 years now. A general purpose machine, it comprises a bed with a guideway. On one end of the bed is mounted the headstock, which provides drive to the spindle mounted with a work-holder. The other end is mounted with a tailstock [Fig. 1.2] which supports longer workpieces on the…

Posted in Machine Tools

Introduction to Machine Tools

Machine tools are devices for cutting materials (mostly metals), to impart them the required shape. They have an in-built arrangement that facilitates the use of various types of detachable cutting tools that can be changed to suit the task at hand, and removed for replacement or resharpening, after wear. The cut-off material obtained is usually in the form of chips. This is the material peeled off the workpiece by the tool. It can be continuous like a ribbon or in broken chips. Classification of Machine Tools Machine tools can be classified according to size: light duty (weighing less than 1 tonne), medium duty (1 to 10 tonnes), and heavy duty (above 10 tonnes)….